inventoryStagedTransactions API- Negative transactionQty in request is depleting the qty from source

Summary:

We have a requirement where subinventory transfer from source to target subinventory needs to be done in Fusion. We're using REST API- inventoryStagedTransactions to achieve the same.
The subinventory transfer is working as expected when we pass the positive transactionQuantity (quantity depletes from source and added in target).
But in case of negative transactionQuantity as well the same behavior is observed where it is depleting the quantity from source subinventory. In this case the expectation is that the quantity should be added in source and depleted from target subinventory.
Can you please help on how can we achieve the subinventory transfer for negative quantity.